If the insulating oil isn't degassed before injection transformer, when the transformer put into operation, since the internal temperature and pressure changes of the transformer body, the gas dissolved in the insulating oil is gradually released, or the surface of the solid insulating oil bubbles will appear, because of the dielectric constant of the bubbles is much larger than the insulating oil, which breakdown voltage below the breakdown voltage of the insulating oil, the bubbles easier partial discharge occurs in the operation, frequent discharge will continue to damage the transformer insulation.
If the dissolved gases in the insulating oil reaches a certain level, it will release large volumes of gas, these gases will not only make the operation of the Buchholz relay air bridge is formed, and may be provided along the direction of the electric field, causing the transformer internal breakdown, it is a serious threat for operation of the transformer.
The gas contained in the insulating oil, and acetylene is a special gas, acetylene generate at 700 degrees. 2 or more under high energy discharge to generate, so become an important basis for determining transformer internal spark discharge or arcing fault, since the insulating the oil in the refining process produces acetylene gas, if don’t degas before inject the oil to transformer, it will seriously affect the discharge of transformer internal fault judgment.
So we suggest use the vacuum oil purifier to do degass process. Vacuum oil purifier works under the vacuum status, it is a basic requirement for vacuum oil purifier machine, if the working vacuum reach to -0.095 MPa, this machine can satisfy the degas demand. If we use this kind machine to degas process for the insulating oil, the gas content will be reduced or down to zero. If the oil contains much gas, we can see it through the vacuum separator viewer, because the oil goes into the vacuum tank which is negative pressure, the gas will transgress under the press action. The vacuum oil purifier can easy pump out those gas to air.
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